ANALYTICAL MODELLING OF STRESS-STRAIN CURVESFOR FIBRE METAL LAMINATES

摘要

In the search for optimalperformance, metals andfibre-reinforced epoxy arecombined to obtain ‘the bestof both worlds’. Anexample is Glare, Glassreinforced aluminium, afibre metal laminate whichconsists of aluminiumlayers and glass fibre layersembedded in epoxyadhesive. The number andthickness of the aluminiumlayers may vary, and alsothe number of prepreglayers and their orientation.The stress-strain curve forthe laminate turned out tobe a combined fibre-metalchart, which depends on thefibre orientation and theloading direction. Methodsto describe stress-strain curves for aluminium have been studied extensively.However, the combination of aluminium and glassprepregin Glare gives a stress-strain curve which is more complex to describe. Plasticity of the aluminium and residual stresses aftercuring, due to the difference in thermal expansion of the constituents, must be taken into account.A tool has been developed to calculate the uniaxial stress-strain curve for an arbitrary fibre metallaminate. The tool is called SSCP, Stress-Strain Calculation Program, and includes plasticity, internalstresses after curing and the effect of prestraining. The stress-strain curve is assumed to be bilinear andthe Bauschinger effect as well as reversed plasticity is taken into account in the prestrain modelling.The method provides an easy and fairly accurate determination of the (laminate) stress-strain curves offibre metal laminates.